Naphtha

a mixture of HYDROCARBONS obtained from several sources including COAL TAR and PETROLEUM. Naphtha from coal tar contains mainly AROMATIC hydrocarbons whereas petroleum naphtha hydrocarbons are predominantly ALIPHATIC.

Taken from Dictionary of Science

_______________________________

Naphtha (pronounced /ˈnæfθə/ or /ˈnæpθə/) normally refers to a number of different flammable liquid mixtures of hydrocarbons, i.e. a distillation product from petroleum or coal tar boiling in a certain range and containing certain hydrocarbons, a broad term encompassing any volatile, flammable liquid hydrocarbon mixture.

Naphtha is used primarily as feedstock for producing a high octane gasoline component (via the catalytic reforming process). It is also used in the petrochemical industry for producing olefins in steam crackers and in the chemical industry for solvent (cleaning) applications.

Taken from Wikipedia

Galactic Noise

background noise from galactic sources

Taken from Dictionary of Science

______________

A diffuse radio signal that comes from the synchrotron radiation of electrons spiraling in the Galaxy's magnetic field. Also known as galactic radiation or galactic radio waves.

The Internet ENCYCLOPEDIA OF SCIENCE

Background

'interference' which affects the reading of a signal that is being measured. The interference signals come from sources such as natural RADIOACTIVITY and COSMIC RAYS and must be allowed for when measurements are being taken.

Taken from Dictionary of Science